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Accounts Receivable (Tables)
 12 Months Ended
Sep. 30, 2018
Receivables [Abstract]  
Schedule of Accounts, Notes, Loans and Financing Receivable
The following table summarizes changes in the allowance for doubtful accounts for the fiscal years ended September 30, 2018, 2017 and 2016.

Allowance for Doubtful Accounts
(in thousands)
 
For the Fiscal Years ended September 30,
 
 
2018
 
2017
 
2016
Balance at beginning of period
 
$
22

 
$
36

 
$
462

Provision adjustment - expense, net of recoveries
 
599

 
23

 
23

Write-offs and other adjustments - deductions to receivable balances
 
(73
)
 
(37
)
 
(449
)
Balance at end of period
 
$
548

 
$
22

 
$
36


The components of accounts receivable consisted of the following:


 
As of September 30,
(in thousands)
 
2018

2017
Accounts receivable, gross
 
$
19,823

 
$
22,287

Allowance for doubtful accounts
 
(548
)
 
(22
)
Accounts receivable, net
 
$
19,275

 
$
22,265